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38 lines
761 B
C
38 lines
761 B
C
// SPDX-License-Identifier: GPL-2.0
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#ifndef TSC_H
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#define TSC_H
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/*
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* Provides access to the CPU timestamp counter.
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*
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* Copyright (C) 2020 Martin Whitaker.
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*/
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#include <stdint.h>
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#define rdtsc(low, high) \
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__asm__ __volatile__("rdtsc" \
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: "=a" (low), \
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"=d" (high) \
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)
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#define rdtscl(low) \
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__asm__ __volatile__("rdtsc" \
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: "=a" (low) \
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: /* no inputs */ \
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: "edx" \
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)
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/*
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* Reads and returns the timestamp counter value.
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*/
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static inline uint64_t get_tsc(void)
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{
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uint32_t tl;
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uint32_t th;
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rdtsc(tl, th);
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return (uint64_t)th << 32 | (uint64_t)tl;
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}
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#endif // TSC_H
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